How are you printing these images? Not all printers handle CMYK images well, especially not consumer grade inkjet printers. If you have one of these, convert your image to RGB before printing.
– Billy KerrApr 7 '17 at 14:46

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I usually create a profile in the printer driver software (many have this facility). I turn off all the "vivid photo" stuff, and set the color management to "manual." This usually eliminates 75% of color problems when printing on office printers: the printer itself is changing things so your grandmother thinks your children are beautiful and the vacation sunsets are amazing.
– YorikApr 7 '17 at 14:47

That's been printed on different consumers' printers... I am only preparing PDF. Are there specific settings for PDF that I should set? (I am adding print-screen of current settings.)
– OleniaApr 21 '17 at 9:15

1 Answer
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If you don't have a profile that is set to change specific RGB range into K channel you will always get "black" split into all CMYK.
In general if you want to use grey it would be wise to add it only in CMYK space.

Remember that a)printing machines add some paint in all channels and b) sometimes (as in very often) printers have their RIP set to add some paint in different plate to compensate for that. For example for the last 7 years I've been working with printer that had 10% extra in the M on machine. So that would relate to "odd" color in something that should be only K.

Thank for the input. Though, what about when I add value for K in CMYK space (and CMYK color mode), but when I click 'OK' and then reopen to check - it's displaying mix of CMYK again...
– OleniaApr 10 '17 at 9:44

@Olenia In what program you make the changes?
– SZCZERZO KŁYApr 10 '17 at 10:02

InDesign seems to keep values, but Illustrator doesn't. And what I noticed now, Illustrator is auto correcting my values even for RGB. I am confused.
– OleniaApr 10 '17 at 10:17

@Olenia Illustrator have a nasty "feature" that remembers the native space and keep profile attached to it. Create new file with CMYK (check if illustrator is showing danger triangle next to color space), copy and paste the content and save.
– SZCZERZO KŁYApr 10 '17 at 10:33